John Kasich/Condoleeza Rice v. Bill De Blasio/Henry Cuellar
Or:
Joe Biden/Loretta Sanchez v. Ted Cruz/Jim DeMint
Just so we're clear, these are my ideal candidates and ideal map; not taking into account the losing candidate's high quality:
296: Condoleeza Rice/Brian Sandoval - 44.9%
242: Joseph Biden/Jerry Brown - 44.0%
Robert Reich/Thom Hartmann - 5.6%
Evan McMullin/David French - 3.2%
Others - 1.2%
I'm fairly certain Jerry Brown, Brian Sandoval, and Condoleeza Rice would send people running to third parties.